CS1880-IB View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS1880-IB

Octal E1 Line Interface Unit

Cirrus Logic 

CS61880

18. APPLICATIONS

+3.3V

RGND

0.1 µF

Note 1

0.1 µF

Note 1

++

TGND

68 µF

Note 2

+3.3V

0.1 µF +

GNDIO

75 Ω +3.3V

Cable

NC

120 Ω

Cable

RV+

VCCIO

TV+

R TIP

0.1 µF

R RIN G

CS61880

One Channel

TRIN G

T TIP

R1

R2

T1 1:2

RECEIVE

LINE

T2 1:1.15

TRANSMIT

LINE

CBLSEL

13.3k Ω

REF

GND

Component

R1 (Ω)

R2 (Ω)

E1 75Ω Coaxial Cable

15

15

E1 120Ω Twisted Pair Cable

15

15

Notes:1) Required Capacitor between each TV+, RV+, VCCIO and TGND, RGND, GNDIO respec-

tively.

2) Common decoupling capacitor for all TVCC and TGND pins.

Figure 16. Internal RX/TX Impedance Matching

50

DS450PP2

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